Demonstration of the background estimates produced by LAMBDAR for pointing KIDS_l85p0_m0p5 in the r-band. Each panel shows a grey-scale image of the pointing, smoothed with a 2″ Gaussian kernel and after masking. Overlaid on this image are various estimates of the image noise level, shown with rectangles covering the extent of the area used for the estimate. Left: Magnitude limits estimated with blanks. Centre: Magnitude limits estimated with the pixel RMS. Right: Correlation factor, estimated as the ratio between the aperture noise RMSs estimated with blanks and pixels. This factor clearly recovers the regions of the image with increased noise correlation caused by residual bright artefacts.